make shopware installation visible via IP adress

we have a ready shopware installation on a nginx server... all 100% working but because of issues with our hoster we took away our domain [login to view URL] and moved it to a different provider. We thought we can make our shopware website visible to our clients via a URL fwd to the IP adress until we have moved all the content to the new server. This is where we are stuck now...and our shopware website is not available....all we have is the ftp login and the IP adress